L Kok, PG van Zyl, JP Beukes, J-S Swartz, RP Burger, Suria Ellis, M Josipovic, V Vakkari, L Laakso, and M Kulmala. “Chemical Composition of Rain at a Regional Site on the South African Highveld”. Water SA, vol. 47, no. 3 July, July 2021, doi:10.17159/wsa/2021.v47.i3.11861.